// Copyright 2004-2007 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// MODIFICATIONS HAVE BEEN MADE TO THIS FILE

using Boo.Lang.Compiler.Ast;
using Boo.Lang.Compiler.Steps;
using Boo.Lang.Compiler.TypeSystem;

namespace MvcContrib.Comdiv.ViewEngines.Brail{
    ///<summary>
    /// Replace any uknown identifier with a call to GetParameter('unknown')
    /// this mean that unknonw identifier in scripts will only fail in run time if they
    /// were not defined by the controller.
    /// </summary>
    public class ReplaceUknownWithParameters : ProcessMethodBodiesWithDuckTyping{
        private IMethod getParam;
        private IMethod tryGetParam;

        public override void OnReferenceExpression(ReferenceExpression node){
            IEntity entity = NameResolutionService.Resolve(node.Name);
            if (entity != null){
                base.OnReferenceExpression(node);
            }
            else{
                MethodInvocationExpression mie = CodeBuilder.CreateMethodInvocation(
                    CodeBuilder.CreateSelfReference(_currentMethod.DeclaringType),
                    GetMethod(node.Name));
                mie.Arguments.Add(GetNameLiteral(node.Name));
                node.ParentNode.Replace(node, mie);
            }
        }

        protected override void InitializeMemberCache(){
            base.InitializeMemberCache();
            getParam = TypeSystemServices.Map(typeof (BrailBase).GetMethod("GetParameter"));
            tryGetParam = TypeSystemServices.Map(typeof (BrailBase).GetMethod("TryGetParameter"));
        }

        public IMethod GetMethod(string name){
            if (name[0] == '?'){
                return tryGetParam;
            }
            else{
                return getParam;
            }
        }

        public StringLiteralExpression GetNameLiteral(string name){
            if (name[0] == '?'){
                return CodeBuilder.CreateStringLiteral(name.Substring(1));
            }
            else{
                return CodeBuilder.CreateStringLiteral(name);
            }
        }
    }
}